کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4482468 1316859 2012 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Control filamentous bulking caused by chlorine-resistant Type 021N bacteria through adding a biocide CTAB
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Control filamentous bulking caused by chlorine-resistant Type 021N bacteria through adding a biocide CTAB
چکیده انگلیسی

Filamentous bulking sludge due to excessive growth of filamentous bacteria is a serious operational problem in activated sludge plants. The addition of chemicals is one of widespread ways to control filamentous bulking. In this study, filamentous bulking in a continuous activated sludge system was found to be mainly caused by Eikelboom Type 021N filamentous bacteria likely due to low substrate concentration gradients. These Type 021N bacteria were found to be resistant to chlorination, maintaining cell integrity at a dosage of up to 80 mg Cl/gSS. An alternative biocidal agent, cetyltrimethyl ammonium bromide (CTAB), exhibited a much stronger biocidal effect on these filaments, which significantly improved sludge settleability. Type 021N with filamentous index of 5 was selectively killed, but floc-formers recovery their activity after CTAB termination. The study implied that CTAB might have more penetration capacity to cell wall of chlorine-resistant Type 021N bacteria. We therefore suggest the penetration property of filament cell wall should be considered or tested before the selection of biocide type in practice.

Figure optionsDownload high-quality image (199 K)Download as PowerPoint slideHighlights
► A chlorine-resistant Type 021N was found.
► CTAB exhibited a much effective biocidal effect on these filaments.
► Type 021N was selectively killed, but floc-formers recovery activity after CTAB termination.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 46, Issue 19, 1 December 2012, Pages 6531–6542
نویسندگان
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